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Strictly speaking, AES and Rijndael encryption are not exactly the same (although they can be interchanged in practical application), because Rijndael encryption can support a wider range of block and key length:

the block length of AES is fixed to 128 bits, and the key length can be 128192 or 256 bits; The key and block length used by Rijndael can be an integral multiple of 32 bits, with 128 bits as the lower limit and 256 bits as the upper limit. The key used in the encryption process is generated by Rijndael key generation scheme

extended data

AES encryption mode

symmetric / block ciphers are generally divided into stream encryption (such as OFB, CFB, etc.) and block encryption (such as ECB, CBC, etc.). For stream encryption, we need to convert the block cipher into stream mode. For block encryption (or packet encryption), if you want to encrypt data larger than the block size, you need to involve padding and chain encryption mode

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disadvantages:

1. Plaintext mode cannot be hidden

2. It is possible to attack plaintext actively

In fact, in our opinion, it is difficult for the CDC to stop publishing all kinds of confirmed numbers. But in fact, this behavior has both advantages and disadvantages. The advantage is that to a certain extent, stopping publishing the confirmed numbers can rece people's panic, which is also a good thing for American universities, Novel coronavirus pneumonia is very important for building a peaceful and stable public opinion environment, but the disadvantage is that the number of confirmed States is not published, which may rece the sensitivity of the American people to the degree of the new crown pneumonia. p> It is difficult for many people to understand that the CDC of the United States announced to stop publishing the number of confirmed cases. However, it can only be said that different countries have different adaptation policies. For the United States, it is not necessarily a bad thing to stop publishing the number of confirmed cases

If you are hospitalized in the Department of respiratory medicine, the diseases that need to be examined by the CDC must be infectious diseases, not ordinary pneumonia, maybe tuberculosis, or other highly infectious virus infections such as SARS and h7n9, or plague reported in the news some time ago. Only the CDC can detect these diseases, but ordinary hospitals can't, so it can't tell you what the disease is, It can only be said that it is suspected of something